Corkscrew



FIG. 1 is a front elevation of the corkscrew showing my new design, the opposite side being a mirror image;

FIG. 2 is a left side elevation thereof, the opposite side being a mirror image;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for the corkscrew, as shown and described. 